NGK Spark Plugs for Boosted Hemi Engines Heat Range 7

797 Performance has done the research to make it easier for you to replace your plugs on your Hemi.  These are a direct replacement plug in a heat range 7 for boosted applications . 5.7 Non -VVT uses a Taper Seal5.7 Eagle uses Washer Seal6.1 uses a heat range 5 and a Taper Seal6.4 uses a heat range 6 and a Taper Seal6.2 SC uses a uses Washer SealManufacturer Spark Plug info - Iridium IX® The improved throttle response, superior anti-fouling and high-ignitability makes Iridium IX® ideal for the performance enthusiast. Iridium’s extremely high melting point is perfectly suited to today’s high-temperature engines, delivering outstanding acceleration, fuel efficiency and durability. Fine iridium tip ensures high durability and a consistently stable spark Trivalent metal plating for superior anti-corrosion and anti-seizing properties Outstanding acceleration, high fuel efficiency and durability